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Product Warranty Reserve (Details) (Warranty Reserves [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Warranty Reserves [Member]
   
Roll forward of the product warranty reserve    
Balance at the beginning of period $ 1,229 $ 824
Additions charged to income 0 422
Warranty usage (157) (182)
Currency translation 10 40
End of period balance $ 1,082 $ 1,104